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374 lines
10 KiB
PHP
374 lines
10 KiB
PHP
<?php
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namespace Sabre\Uri;
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/**
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* This file contains all the uri handling functions.
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*
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* @copyright Copyright (C) fruux GmbH (https://fruux.com/)
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* @author Evert Pot (http://evertpot.com/)
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* @license http://sabre.io/license/
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*/
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/**
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* Resolves relative urls, like a browser would.
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*
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* This function takes a basePath, which itself _may_ also be relative, and
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* then applies the relative path on top of it.
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*
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* @param string $basePath
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* @param string $newPath
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* @return string
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*/
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function resolve($basePath, $newPath) {
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$base = parse($basePath);
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$delta = parse($newPath);
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$pick = function($part) use ($base, $delta) {
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if ($delta[$part]) {
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return $delta[$part];
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} elseif ($base[$part]) {
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return $base[$part];
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}
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return null;
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};
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// If the new path defines a scheme, it's absolute and we can just return
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// that.
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if ($delta['scheme']) {
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return build($delta);
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}
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$newParts = [];
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$newParts['scheme'] = $pick('scheme');
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$newParts['host'] = $pick('host');
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$newParts['port'] = $pick('port');
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$path = '';
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if ($delta['path']) {
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// If the path starts with a slash
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if ($delta['path'][0] === '/') {
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$path = $delta['path'];
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} else {
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// Removing last component from base path.
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$path = $base['path'];
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if (strpos($path, '/') !== false) {
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$path = substr($path, 0, strrpos($path, '/'));
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}
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$path .= '/' . $delta['path'];
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}
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} else {
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$path = $base['path'] ?: '/';
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}
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// Removing .. and .
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$pathParts = explode('/', $path);
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$newPathParts = [];
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foreach ($pathParts as $pathPart) {
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switch ($pathPart) {
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//case '' :
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case '.' :
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break;
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case '..' :
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array_pop($newPathParts);
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break;
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default :
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$newPathParts[] = $pathPart;
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break;
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}
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}
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$path = implode('/', $newPathParts);
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// If the source url ended with a /, we want to preserve that.
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$newParts['path'] = $path;
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if ($delta['query']) {
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$newParts['query'] = $delta['query'];
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} elseif (!empty($base['query']) && empty($delta['host']) && empty($delta['path'])) {
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// Keep the old query if host and path didn't change
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$newParts['query'] = $base['query'];
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}
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if ($delta['fragment']) {
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$newParts['fragment'] = $delta['fragment'];
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}
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return build($newParts);
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}
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/**
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* Takes a URI or partial URI as its argument, and normalizes it.
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*
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* After normalizing a URI, you can safely compare it to other URIs.
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* This function will for instance convert a %7E into a tilde, according to
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* rfc3986.
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*
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* It will also change a %3a into a %3A.
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*
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* @param string $uri
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* @return string
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*/
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function normalize($uri) {
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$parts = parse($uri);
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if (!empty($parts['path'])) {
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$pathParts = explode('/', ltrim($parts['path'], '/'));
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$newPathParts = [];
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foreach ($pathParts as $pathPart) {
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switch ($pathPart) {
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case '.':
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// skip
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break;
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case '..' :
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// One level up in the hierarchy
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array_pop($newPathParts);
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break;
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default :
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// Ensuring that everything is correctly percent-encoded.
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$newPathParts[] = rawurlencode(rawurldecode($pathPart));
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break;
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}
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}
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$parts['path'] = '/' . implode('/', $newPathParts);
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}
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if ($parts['scheme']) {
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$parts['scheme'] = strtolower($parts['scheme']);
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$defaultPorts = [
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'http' => '80',
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'https' => '443',
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];
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if (!empty($parts['port']) && isset($defaultPorts[$parts['scheme']]) && $defaultPorts[$parts['scheme']] == $parts['port']) {
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// Removing default ports.
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unset($parts['port']);
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}
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// A few HTTP specific rules.
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switch ($parts['scheme']) {
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case 'http' :
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case 'https' :
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if (empty($parts['path'])) {
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// An empty path is equivalent to / in http.
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$parts['path'] = '/';
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}
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break;
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}
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}
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if ($parts['host']) $parts['host'] = strtolower($parts['host']);
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return build($parts);
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}
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/**
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* Parses a URI and returns its individual components.
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*
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* This method largely behaves the same as PHP's parse_url, except that it will
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* return an array with all the array keys, including the ones that are not
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* set by parse_url, which makes it a bit easier to work with.
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*
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* Unlike PHP's parse_url, it will also convert any non-ascii characters to
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* percent-encoded strings. PHP's parse_url corrupts these characters on OS X.
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*
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* @param string $uri
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* @return array
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*/
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function parse($uri) {
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// Normally a URI must be ASCII, however. However, often it's not and
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// parse_url might corrupt these strings.
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//
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// For that reason we take any non-ascii characters from the uri and
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// uriencode them first.
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$uri = preg_replace_callback(
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'/[^[:ascii:]]/u',
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function($matches) {
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return rawurlencode($matches[0]);
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},
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$uri
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);
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$result = parse_url($uri);
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if (!$result) {
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$result = _parse_fallback($uri);
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}
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return
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$result + [
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'scheme' => null,
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'host' => null,
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'path' => null,
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'port' => null,
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'user' => null,
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'query' => null,
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'fragment' => null,
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];
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}
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/**
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* This function takes the components returned from PHP's parse_url, and uses
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* it to generate a new uri.
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*
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* @param array $parts
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* @return string
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*/
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function build(array $parts) {
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$uri = '';
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$authority = '';
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if (!empty($parts['host'])) {
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$authority = $parts['host'];
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if (!empty($parts['user'])) {
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$authority = $parts['user'] . '@' . $authority;
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}
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if (!empty($parts['port'])) {
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$authority = $authority . ':' . $parts['port'];
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}
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}
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if (!empty($parts['scheme'])) {
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// If there's a scheme, there's also a host.
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$uri = $parts['scheme'] . ':';
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}
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if ($authority || (!empty($parts['scheme']) && $parts['scheme'] === 'file')) {
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// No scheme, but there is a host.
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$uri .= '//' . $authority;
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}
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if (!empty($parts['path'])) {
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$uri .= $parts['path'];
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}
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if (!empty($parts['query'])) {
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$uri .= '?' . $parts['query'];
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}
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if (!empty($parts['fragment'])) {
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$uri .= '#' . $parts['fragment'];
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}
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return $uri;
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}
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/**
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* Returns the 'dirname' and 'basename' for a path.
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*
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* The reason there is a custom function for this purpose, is because
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* basename() is locale aware (behaviour changes if C locale or a UTF-8 locale
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* is used) and we need a method that just operates on UTF-8 characters.
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*
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* In addition basename and dirname are platform aware, and will treat
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* backslash (\) as a directory separator on windows.
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*
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* This method returns the 2 components as an array.
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*
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* If there is no dirname, it will return an empty string. Any / appearing at
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* the end of the string is stripped off.
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*
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* @param string $path
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* @return array
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*/
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function split($path) {
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$matches = [];
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if (preg_match('/^(?:(?:(.*)(?:\/+))?([^\/]+))(?:\/?)$/u', $path, $matches)) {
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return [$matches[1], $matches[2]];
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}
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return [null,null];
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}
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/**
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* This function is another implementation of parse_url, except this one is
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* fully written in PHP.
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*
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* The reason is that the PHP bug team is not willing to admit that there are
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* bugs in the parse_url implementation.
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*
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* This function is only called if the main parse method fails. It's pretty
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* crude and probably slow, so the original parse_url is usually preferred.
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*
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* @param string $uri
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* @return array
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*/
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function _parse_fallback($uri) {
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// Normally a URI must be ASCII, however. However, often it's not and
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// parse_url might corrupt these strings.
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//
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// For that reason we take any non-ascii characters from the uri and
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// uriencode them first.
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$uri = preg_replace_callback(
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'/[^[:ascii:]]/u',
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function($matches) {
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return rawurlencode($matches[0]);
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},
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$uri
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);
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$result = [
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'scheme' => null,
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'host' => null,
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'port' => null,
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'user' => null,
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'path' => null,
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'fragment' => null,
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'query' => null,
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];
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if (preg_match('% ^([A-Za-z][A-Za-z0-9+-\.]+): %x', $uri, $matches)) {
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$result['scheme'] = $matches[1];
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// Take what's left.
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$uri = substr($uri, strlen($result['scheme']) + 1);
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}
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// Taking off a fragment part
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if (strpos($uri, '#') !== false) {
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list($uri, $result['fragment']) = explode('#', $uri, 2);
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}
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// Taking off the query part
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if (strpos($uri, '?') !== false) {
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list($uri, $result['query']) = explode('?', $uri, 2);
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}
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if (substr($uri, 0, 3) === '///') {
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// The triple slash uris are a bit unusual, but we have special handling
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// for them.
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$result['path'] = substr($uri, 2);
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$result['host'] = '';
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} elseif (substr($uri, 0, 2) === '//') {
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// Uris that have an authority part.
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$regex = '
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%^
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//
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(?: (?<user> [^:@]+) (: (?<pass> [^@]+)) @)?
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(?<host> ( [^:/]* | \[ [^\]]+ \] ))
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(?: : (?<port> [0-9]+))?
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(?<path> / .*)?
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$%x
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';
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if (!preg_match($regex, $uri, $matches)) {
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throw new InvalidUriException('Invalid, or could not parse URI');
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}
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if ($matches['host']) $result['host'] = $matches['host'];
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if ($matches['port']) $result['port'] = (int)$matches['port'];
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if (isset($matches['path'])) $result['path'] = $matches['path'];
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if ($matches['user']) $result['user'] = $matches['user'];
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if ($matches['pass']) $result['pass'] = $matches['pass'];
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} else {
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$result['path'] = $uri;
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}
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return $result;
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}
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